Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Idle Speed Control
Idle speed is kept at the optimum speed by controlling the amount of air that by-passes the throttle valve in accordance with changes in idling conditions and engine load during idling. The ECM drives the Idle Speed Control (ISC) motor to keep the engine running at the pre-set idle target speed in accordance with the engine coolant temperature and air conditioning load. When the air conditioning switch is turned off and on while the engine is idling, the ISC motor operates to adjust the throttle valve by-pass air amount in accordance with the engine load conditions in order to avoid fluctuations in the engine speed.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.